import {
  createBranch,
  createIssue,
  createPullRequest,
  fetchTransport,
  listIssues,
} from "@code/primitives/git-remote-runtime";
import type {
  GitRemoteConfig,
  GitRemoteError,
} from "@code/primitives/git-remote-runtime";
import { defineTool } from "@flue/runtime";
import { Effect } from "effect";
import * as v from "valibot";

/**
 * Canonical repo for the bootstrap: one self-hosted Gitea repo hosts all work.
 * Hard-coded owner/repo keeps the agent off credential-shaped free input.
 */
export const CANONICAL_REPO = { owner: "puter", repo: "zopu-code" } as const;

export const makeGitRemoteConfig = (runtimeEnv: {
  readonly GITEA_TOKEN?: string;
  readonly GITEA_URL: string;
}): GitRemoteConfig => {
  if (!runtimeEnv.GITEA_TOKEN) {
    throw new Error(
      "GITEA_TOKEN is required to configure the git remote tools"
    );
  }
  return {
    baseUrl: runtimeEnv.GITEA_URL,
    owner: CANONICAL_REPO.owner,
    repo: CANONICAL_REPO.repo,
    token: runtimeEnv.GITEA_TOKEN,
  };
};

const run = <A, E>(eff: Effect.Effect<A, E>): Promise<A> =>
  Effect.runPromise(eff);

const describeError = (error: GitRemoteError) => ({
  error: error.message,
  reason: error.reason,
});

// Tool returns are serialized to the model; round-trip through JSON so the
// Effect-branded/readonly value objects become plain mutable JsonValue.
// oxlint-disable-next-line unicorn/prefer-structured-clone -- structuredClone keeps readonly modifiers; JSON erases them for JsonValue
const json = (value: unknown) => JSON.parse(JSON.stringify(value));

/**
 * Git-remote tools bound to the canonical repo. The agent creates issues,
 * branches, and pull requests on puter/zopu-code via the Gitea API using the
 * server-side token — it never accepts credentials or repo paths as input.
 */
export const createGitRemoteTools = (config: GitRemoteConfig) => [
  defineTool({
    description:
      "Create an issue on the canonical zopu-code repository. Use this to turn an agreed-upon piece of work into a tracked issue. Returns the issue number and URL. Always call list_issues first to avoid duplicates.",
    input: v.object({
      body: v.string(),
      title: v.string(),
    }),
    name: "create_issue",
    async run({ input }) {
      const result = await run(
        createIssue(fetchTransport, config, input)
      ).catch(describeError);
      return json(result);
    },
  }),

  defineTool({
    description:
      "List open issues on the canonical zopu-code repository. Call this before creating an issue to check for duplicates and understand existing work.",
    name: "list_issues",
    async run() {
      const result = await run(listIssues(fetchTransport, config)).catch(
        describeError
      );
      return json(result);
    },
  }),

  defineTool({
    description:
      "Create a remote branch on the canonical zopu-code repository. Usually you do not need this directly — start_workflow handles branching for a work run. Use only when explicitly setting up a branch by hand.",
    input: v.object({
      from: v.optional(v.string()),
      name: v.string(),
    }),
    name: "create_branch",
    async run({ input }) {
      const result = await run(
        createBranch(fetchTransport, config, input)
      ).catch(describeError);
      return json(result);
    },
  }),

  defineTool({
    description:
      "Open a pull request on the canonical zopu-code repository. Provide the work branch, the base branch (usually main), a title, and a body. Returns the PR number and URL.",
    input: v.object({
      baseBranch: v.string(),
      body: v.string(),
      branch: v.string(),
      title: v.string(),
    }),
    name: "create_pull_request",
    async run({ input }) {
      const result = await run(
        createPullRequest(fetchTransport, config, input)
      ).catch(describeError);
      return json(result);
    },
  }),
];